/*
    Copyright (C) 2013 maik.jablonski@jease.org

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package sample.service;

import java.util.List;

import jfix.db4o.Database;
import sample.domain.Sequence;

public class Ids {

	private static Sequence sequence;

	static {
		List<Sequence> sequences = Database.query(Sequence.class);
		if (sequences.isEmpty()) {
			sequence = new Sequence();
		} else {
			sequence = sequences.get(0);
		}
	}

	public static synchronized int next() {
		int nextId = sequence.next();
		Database.save(sequence);
		return nextId;
	}
}
